WO2021145047A1

WO2021145047A1 - Molding die and sealing member

Info

Publication number: WO2021145047A1
Application number: PCT/JP2020/040250
Authority: WO
Inventors: 瞬村崎; 文平吉田
Original assignee: Nok株式会社
Priority date: 2020-01-16
Filing date: 2020-10-27
Publication date: 2021-07-22
Also published as: US20230001613A1; JPWO2021145047A1; EP4091787A4; EP4091787A1; CN114786910A; JP7129575B2

Abstract

A molding die 10 for molding an endless-shaped gasket made of an elastic material on a surface 2a of a plate-like base material 2 is provided with: a cavity portion 4 formed on an opposite face 12a opposite to the surface 2a of the base material 2 and corresponding to the shape of the gasket; a gate 5 for introducing a molding material that hardens into the elastic material; a first intermediate portion 41 that connects an opening of the gate 5 with the cavity portion 4, and of which a cross section along the surface 2a of the base material 2 has a cross-sectional area greater than an opening area of the opening of the gate 5; a vent 6 for discharging unwanted gas that is not necessary for molding; and a second intermediate portion 42 that connects an opening of the vent 6 on the cavity portion 4 side extending along the surface 2a of the base material 2 with the cavity portion 4, and of which a cross section along the surface 2a of the base material 2 has a cross-sectional area greater than the opening area of the opening of the gate 5.

Description

Molding molds and seal parts

The present invention forms a molding die for molding an endless gasket made of an elastic material on the surface of a plate-shaped base material and extending along the surface of the base material, and a plate-shaped base material and molding on the surface of the base material. The present invention relates to a sealing component made of an elastic material and provided with an endless gasket extending along the surface of a substrate.

A molding die for forming an endless gasket made of an elastic material on the surface of a plate-shaped base material and extending along the surface of the base material has been conventionally known (see, for example, Patent Document 1). Such molding dies can be used, for example, in the manufacture of sealing parts that prevent fluid from leaking onto a substrate through gaskets. As a typical example of such a sealing component, a sealing component for a separator laminated on both sides of a membrane / electrode assembly (hereinafter referred to as MEA) in a fuel cell is well known. In the fuel cell separator, it is necessary to supply the fuel cell fluid (fuel gas containing hydrogen, oxidant gas containing oxygen, etc.) to the MEA so that it does not leak to the outside, and the endless gasket is such a fuel cell. It serves to seal the fuel for use in the space surrounded by the gasket.

FIG. 4 is a schematic view of a seal component 1'for a fuel cell separator, and FIG. 5 is a schematic cross-sectional view of the seal component 1'shown in FIG.

As shown in FIG. 4, in the sealing component 1', an endless gasket 3 made of an elastic material and extending along the surface of the base material 2 is formed around the ventilation holes 2b on the surface of the plate-shaped base material 2. There is. FIG. 5 shows a schematic cross section of the sealing component 1'along the AA' line of FIG. 4, and the gasket 3 is represented as four protrusions protruding from the surface of the base material 2. .. As shown in FIG. 5, the gasket 3 has a base portion 3a adhered to the surface of the base material 2 and a seal lip portion 3b protruding from the base portion 3a in a mountain shape. Here, on the AA'line of FIG. 4, as will be described later, there is a portion where the molding material of the gasket 3 flows in and out when the gasket 3 is molded. Hereinafter, a conventional molding die for manufacturing a seal component 1'for a fuel cell separator as shown in FIGS. 4 and 5 by molding a gasket 3 on the surface of the base material 2 will be described.

FIG. 6 is a schematic cross-sectional view of a conventional molding die 10'for molding the gasket 3 on the surface 2a of the base material 2.

FIG. 6 shows a cross section of a portion of the conventional molding die 10'that molds the gasket 3 on the surface 2a of the base material 2 that realizes the cross-sectional shape of FIG. 5 of the sealing part 1'. As shown in FIG. 6, the conventional molding die 10'includes a cavity 4, a gate 5', and a vent 6'. The cavity portion 4 is a portion formed on the facing surface 12a'of the molding die 10'opposing the surface 2a of the base material 2 and having a mold shape corresponding to the endless shape of the gasket 3 of FIGS. 4 and 5. .. The gate 5'is a hole extending toward the cavity 4 in the molding die 10', and is a hole for introducing a fluid molding material which becomes the elastic material described above into the cavity 4 when cured. be. Further, the vent 6'is a hole extending in the molding die 10'in the direction away from the cavity portion 4, and is a hole for discharging unnecessary gas unnecessary for forming the gasket in the cavity portion 4 from the cavity portion 4. Is. Further, the surplus molding material after filling all the cavities 4 is also discharged from the cavities 4 to the vent 6'.

In the conventional molding die 10', the molding material is injected into the molding die 10', the cavity 4 is filled with the molding material, and then the molding material is cured to cure the surface of the base material 2. A gasket 3 made of an elastic material (see FIGS. 4 and 5) is formed in 2a. However, the molding material accumulated in the gate 5'and the vent 6'is also cured in the same manner, and the molding material opening 6a in the vicinity of the molding material opening 5a'in the gate 5'and in the vent 6' It is connected to gasket 3 near'. When the base material 2 is removed from the molding die 10', the gasket 3 and other parts are separated from each other, whereby the sealing part 1'in which the gasket 3 is formed on the surface 2a of the base material 2 is completed.

International Publication No. 2010/11558

However, when the gasket 3 and other parts are separated from each other, such separation is performed at a portion that normally belongs to the gasket 3, and a chip (eggle) occurs in which the surface 2a of the base material 2 is exposed. I have something to do.

FIG. 7 is a diagram showing the egre E'generated on the gasket 3.

FIG. 7 shows a state in which an egre E'is generated in the base portion 3a near the opening 5a'of the gate 5'and the surface 2a of the base material 2 is exposed. In such a state where the surface 2a of the base material 2 is exposed, there is a concern that the insulating property may be deteriorated. In the above, the egre E'generated in the gasket 3 near the gate 5'has been described as an example, but the same egre may occur in the gasket 3 near the vent 6'.

In view of the above circumstances, the present invention realizes a molding die that suppresses the deterioration of the insulating property due to egre, and a sealing component that suppresses the deterioration of the insulating property due to the egre.

In order to solve the above-mentioned problems, the present invention provides the following molding dies and sealing parts.

[1] In a molding die made of an elastic material and extending along the surface of the base material on the surface of a plate-shaped base material, the molding mold facing the surface of the base material. A cavity formed on the facing surface of the mold and having a mold shape corresponding to the endless shape of the gasket, and a flow extending toward the cavity in the molding mold and becoming the elastic material by hardening. A gate for introducing a sex molding material into the cavity portion, and a first intermediate portion that receives the molding material from the gate and feeds the molding material into the cavity portion, and is opened toward the cavity portion side. In the first intermediate portion connecting the opening of the gate and the cavity and having a cross section along the surface of the base material having a cross-sectional area equal to or larger than the opening area of the opening of the gate, and in the molding die. A vent extending in a direction away from the cavity portion for discharging unnecessary gas unnecessary for molding the gasket in the cavity portion from the cavity portion, and a second vent for receiving the unnecessary gas from the cavity portion and sending the unnecessary gas to the vent. An intermediate portion that connects the opening of the vent that opens toward the cavity side and the cavity, and the cross section of the base material along the surface is equal to or larger than the opening area of the opening of the vent. A molding die comprising a second intermediate portion having a cross-sectional area.

Here, the "endless shape" refers to a shape that circulates and returns while continuously extending one-dimensionally and has no end because it circulates and returns. Further, the "cavity portion", "gate", "vent", "first intermediate portion", and "second intermediate portion" all refer to the shape of a part of the molding die forming a specific space. It is not a word that refers to the intangible space itself. Further, the above-mentioned "elastic material" includes not only a rubber material but also a resin material having elasticity.

[2] The molding die is a split type molding die, and the first split mold on which the base material is placed in contact with the surface of the base material on the side opposite to the surface of the base material. It is a second split type that sandwiches the base material with the first split type and fixes the base material, and has the facing surface on which the cavity portion is formed as a surface on the side that sandwiches the base material. At the same time, the gate, the first intermediate portion, the vent, and the second intermediate portion are formed inside, and further extend in a direction along the base material on a surface opposite to the facing surface and connect to the gate. A second split type in which a runner is formed and a third split type laminated on the opposite surface of the second split type, the second split type penetrating the third split type. The molding die according to [1], further comprising a third split die in which a spool connected to the runner is formed.

[3] The molding die according to [1] or [2], wherein the molding die is a molding die for manufacturing a seal component for a fuel cell in which the gasket is integrally molded with the base material. ..

[4] A plate-shaped base material and an endless gasket formed on the surface of the base material and made of an elastic material and extending along the surface of the base material are provided, and the gasket is cured. The fluid molding material to be the elastic material is molded by being injected into a molding mold having a gate and a vent, and is formed at a position close to the gate at the time of molding and at the time of molding. A sealing component having a pedestal protruding in a direction away from the surface of the base material at each of the positions close to the vent in the above.

In the molding die of the present invention, the gate or vent does not open directly into the cavity, but the first intermediate portion and the second intermediate portion provided between the gate and the cavity and between the vent and the cavity. Open to. Since such a first intermediate portion and a second intermediate portion intervene, egress may occur in the molding material cured in the intermediate portion, but egress that exposes the surface of the base material is less likely to occur. ing. Similarly, in the sealing component of the present invention, the presence of the pedestal makes it difficult for egress to expose the surface of the base material. As a result, in the present invention, deterioration of the insulating property due to egre can be suppressed.

It is a schematic cross-sectional view of the molding die of one Embodiment of this invention which forms an endless gasket which is made of an elastic material and extends along the surface of a base material on the surface of a plate-shaped base material. It is an enlarged view of the periphery of the 1st intermediate part in the cross-sectional view of FIG. It is a schematic cross-sectional view which showed the cross section of the seal component in the vicinity of the gate of FIG. It is a schematic diagram of the seal component for a separator of a fuel cell. It is a schematic cross-sectional view of the seal component shown in FIG. It is a schematic cross-sectional view of the conventional molding die which molds a gasket on the surface of a base material. It is a figure which shows the egre generated in the gasket.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited to the following embodiments, and it is understood that design changes, improvements, etc. may be appropriately made based on the ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. It should be.

In the following, the molding die of the present embodiment is a seal component of the same type as the seal component 1'shown in FIGS. 4 and 5 (however, as will be described later, unlike FIG. 7, a pedestal for avoiding egre E'). (See the pedestal 3c in FIG. 3) is further provided), and the case where it is a molding die for manufacturing will be described as an example. The seal component 1 (see FIG. 3) manufactured by the molding die of the present embodiment corresponds to one embodiment of the seal component of the present invention.

FIG. 1 is a schematic diagram of a molding die 10 according to an embodiment of the present invention, in which an endless gasket 3 made of an elastic material and extending along the surface 2a of the base material 2 is formed on the surface 2a of the plate-shaped base material 2. Cross-sectional view.

FIG. 1 shows a cross section of a molding die 10 of a portion that realizes a cross-sectional shape of a seal part to be manufactured (see the seal part 1 of FIG. 3 described later) as in FIG. 6 described above. In FIG. 1, the same components as those of the conventional molding die 10'described in FIGS. 6 and 7 described above are designated by the same reference numerals, and the same reference numerals are also used below. Give an explanation. The molding die 10 includes a cavity portion 4, a gate 5, a first intermediate portion 41, a vent 6, and a second intermediate portion 42.

As described above, the cavity portion 4 is formed on the facing surface 12a of the molding die 10 facing the surface 2a of the base material 2, and has a mold shape corresponding to the endless shape of the gasket 3 of FIGS. 4 and 5. It is a part.

The gate 5 is a hole extending toward the cavity portion 4 in the molding die 10, and is a hole for introducing a fluid molding material which becomes the elastic material described above into the cavity portion 4 when cured. As shown in FIG. 1, the gate 5 has a shape that tapers toward the cavity portion 4, and the tip of the tapered shape opens toward the cavity portion 4, and the molding material is the gate 5. It is an opening 5a (see FIG. 2 described later) that flows out from.

The first intermediate portion 41 forms an intermediate space between the gate 5 and the cavity portion 4, and plays a role of receiving the molding material from the gate 5 and feeding the molding material into the cavity portion 4 through the opening 5a.

FIG. 2 is an enlarged view of the periphery of the first intermediate portion 41 in the cross-sectional view of FIG.

The first intermediate portion 41 connects the opening 5a of the gate 5 that opens toward the cavity portion 4 side and the cavity portion 4, and the cross section of the first intermediate portion 41 along the surface 2a of the base material 2 is It has a cross-sectional area equal to or larger than the opening area of the opening 5a of the gate 5. The technical effect of the first intermediate portion 41 having such a configuration will be described in detail later. In FIG. 2, as a specific example of such a configuration, a first bottom portion 41a extending along the surface 2a of the base material 2 around the opening 5a of the gate 5 and a peripheral edge of the first bottom portion 41a to the cavity portion 4 A first intermediate portion 41 having a tubular first side surface portion 41b extending toward the periphery and connecting the peripheral edge of the first bottom portion 41a and the cavity portion 4 is shown.

Hereinafter, description will be made based on such a specific example, but the first intermediate portion of the present invention does not have the first bottom portion 41a and extends from the opening portion 5a of the gate 5 toward the cavity portion 4 of the gate 5. It may be a first intermediate portion formed by a tubular first side surface portion that directly connects the opening portion 5a and the cavity portion 4. In this case, the cross section of the first intermediate portion has the same cross-sectional area as the opening area of the opening 5a of the gate 5. The "cylindrical shape" in the above description is not limited to the shape of a cylinder having a circular cross section, but also has a shape having a smooth curved outer shell such as an elliptical cross section or a race track shape, or a square cylinder having a polygonal cross section. Includes the shape of. Further, the first intermediate portion of the present invention does not have the first bottom portion 41a, but extends from the opening portion 5a of the gate 5 toward the cavity portion 4, and is a taper that connects the opening portion 5a of the gate 5 and the cavity portion 4 as they are. It may be the first intermediate portion formed by the shaped side surface portion. In this case, the cross section of the first intermediate portion has a cross-sectional area larger than the opening area of the opening 5a of the gate 5.

Return to FIG. 1 and continue the explanation of the components.

The vent 6 is a hole extending in the molding die 10 in a direction away from the cavity portion 4, and is a flow path of unnecessary gas for discharging unnecessary gas unnecessary for molding the gasket 3 in the cavity portion 4 from the cavity portion 4. It is a hole that becomes. Here, the unnecessary gas is air in the cavity 4 extruded by the inflow of the molding material into the cavity 4 during molding, volatile gas generated from the molding material, or the like. Further, the surplus molding material not used for molding the gasket 3 is also discharged from the cavity 4 through the vent 6, and the discharged surplus molding material is the surplus material provided in the molding die 10. It is stored in the pool 6b. As shown in FIG. 1, the vent 6 also has a shape that tapers toward the cavity 4 like the gate 5, and the tip of the tapered shape opens toward the cavity 4 side. It is an opening 6a through which the molding material flows into the vent 6.

The second intermediate portion 42 forms an intermediate space between the cavity portion 4 and the vent 6, receives the molding material from the cavity portion 4, and feeds the molding material to the vent 6 through the opening 6a. Play a role. The configuration of the second intermediate portion 42 is the same as the configuration of the first intermediate portion 41 shown in FIG. That is, the second intermediate portion 42 connects the opening 6a of the vent 6 that opens toward the cavity portion 4 side and the cavity portion 4, and the second intermediate portion 42 of the second intermediate portion 42 along the surface 2a of the base material 2. The cross section has a cross-sectional area equal to or larger than the opening area of the opening 6a of the vent 6. The technical effect of the second intermediate portion 42 having such a configuration will be described in detail later. In the following, as a specific example of the second intermediate portion 42 having such a configuration, the second intermediate portion 42 is placed around the opening 6a of the vent 6 in the same manner as the configuration of the first intermediate portion 41 shown in FIG. A second bottom portion extending along the surface 2a of the base material 2 and a tubular second side surface portion extending from the peripheral edge of the second bottom portion toward the cavity portion 4 and connecting the peripheral edge of the second bottom portion and the cavity portion 4 are formed. I will explain as if I have it. Therefore, FIG. 2 will be referred to for the configuration of the second intermediate portion 42, and the illustration thereof will be omitted here.

However, the second intermediate portion of the present invention does not have a second bottom portion, and has a tubular shape that extends from the opening 6a of the vent 6 toward the cavity 4 and connects the opening 6a of the vent 6 and the cavity 4 as they are. It may be a second intermediate portion formed by the second side surface portion of the above. In this case, the cross section of the second intermediate portion has the same cross-sectional area as the opening area of the opening 6a of the vent 6. Further, the second intermediate portion of the present invention does not have a second bottom portion, but has a tapered shape that extends from the opening 6a of the vent 6 toward the cavity 4 and connects the opening 6a of the vent 6 and the cavity 4 as they are. It may be a second intermediate portion formed by the side surface portions of the above. In this case, the cross section of the second intermediate portion has a cross-sectional area larger than the opening area of the opening 6a of the vent 6.

In the following, the technical effect caused by the first intermediate portion 41 and the second intermediate portion 42 will be described in detail while briefly explaining the molding flow in the molding die 10.

At the time of molding, the molding material flows from the gate 5 to the cavity 4 via the first intermediate portion 41. The flowing molding material flows along the cavity 4 with the cavity 4 extending along the surface 2a of the base material 2 as a flow path (the shape of the gasket 3 in FIGS. 4 and 5 corresponding to the cavity 4). (See), filling all the cavities 4. At this time, the air existing in the cavity portion 4 before the inflow of the molding material and unnecessary gas such as volatile gas generated from the molding material are different from the first intermediate portion 41 in the cross-sectional view of FIG. The gas is discharged from the cavity 4 to the vent 6 via the second intermediate 42 located on the opposite side in the horizontal direction of the above. Further, the surplus molding material after filling all the cavities 4 is also discharged from the cavities 4 to the vent 6 via the second intermediate portion 42. Then, the molding material is cured (typically cross-linked and cured over time), and the curing of the molding material causes a gasket 3 made of an elastic material on the surface 2a of the base material 2 (see FIGS. 4 and 5). Is formed. At this stage, the molding material accumulated in the gate 5, the vent 6, the first intermediate portion 41, and the second intermediate portion 42 is similarly cured and connected to the gasket 3. When the base material 2 is removed from the molding die 10', the gasket 3 and other parts are separated from each other, thereby completing the sealing component 1 in which the gasket 3 is formed on the surface 2a of the base material 2.

When the gasket 3 and other parts are separated from each other, such separation is performed at a portion that normally belongs to the gasket 3, and a chip (eggle) that exposes the surface 2a of the base material 2 occurs. Sometimes. In such a state where the surface 2a of the base material 2 is exposed, there is a concern that the insulating property may be deteriorated. However, in the molding die 10 of the present embodiment, as described below, a device for suppressing a decrease in insulating property due to egre is devised.

FIG. 3 is a schematic cross-sectional view showing a cross section of the seal component 1 in the vicinity of the gate 5 of FIG.

FIG. 3 shows that the molding material cured in the first intermediate portion 41 of FIG. 2 outside the opening 5a of the gate 5 was separated, so that Egre E is generated in this portion. ing. Since the first intermediate portion 41 is interposed between the gate 5 and the cavity portion 4 (see FIG. 2), unlike the state of FIG. 7, the egre E does not extend to the surface 2a of the base material 2. , The deterioration of insulation due to egre is suppressed. In the above, the technical effect of the first intermediate portion 41 has been described by taking the egre E generated near the gate 5 as an example, but the second intermediate portion 42 has the same technical effect as the egre generated near the vent 6. It is effective.

As described above, in the present embodiment, the presence of the first intermediate portion 41 and the second intermediate portion 42 realizes a molding die that suppresses deterioration of the insulating property due to egre.

Here, the sealing component of FIG. 3 is provided with a plate-shaped base material 2 and an endless gasket 3 made of an elastic material formed on the surface 2a of the base material 2 and extending along the surface 2a of the base material 2. 1 corresponds to one embodiment of the sealing component of the present invention. As described above, the gasket 3 is formed by injecting a fluid molding material, which becomes an elastic material by curing, into a molding die 10 having a gate 5 and a vent 6. In addition to the base portion 3a and the seal lip portion 3b described above in FIGS. 3 and 4, the gasket 3 is provided at a position close to the gate 5 at the time of molding (that is, a position closest to the opening 5a of the gate 5) and. Each of the positions close to the vent 6 at the time of molding (that is, the position closest to the opening 6a of the vent 6) has a pedestal 3c protruding in a direction away from the surface 2a of the base material 2. The presence of such a pedestal 3c makes it difficult for the surface 2a of the base material 2 to be exposed, and the deterioration of the insulating property due to the egress is suppressed.

Returning to FIG. 1, the configuration of the molding die 10 will be described in more detail.

The molding die of the present invention is preferably a split type molding die such as the molding die 10 shown in FIG. The split type molding die 10 is provided with three split dies of a first split die 11, a second split die 12, and a third split die 13, and an aggregate of these three split dies is molded into one. Functions as a mold 10. Hereinafter, each divided type will be described.

The first split type 11 is a split type in which the base material 2 is placed in contact with the surface of the base material 2 on the side opposite to the surface 2a of the base material 2.

The second split type 12 is a split type in which the base material 2 is sandwiched between the first split type 11 and the base material 2 is fixed, and the cavity portion 4 of FIG. 1 is formed as a surface on the side where the base material 2 is sandwiched. It has a facing surface 12a. Inside the second split mold 12, the gate 5, the first intermediate portion 41, the vent 6, and the second intermediate portion 42 described above in the description of FIG. 1 are formed. Further, a runner 7 extending in the direction along the base material 2 and connecting to the gate 5 is formed on the surface of the second split type 12 opposite to the facing surface 12a.

The third division type 13 is a division type that is laminated on the surface of the second division type 12 on the side opposite to the facing surface 12a. The third split mold 13 is formed with a spool 8 that penetrates the third split mold 13 and connects to the runner 7 of the second split mold 12.

In such a division type molding die 10, first, the base material 2 is sandwiched and fixed between the first division mold 11 and the second division mold 12 in the above-described embodiment, and is fixed on the surface of the second division mold 12. The molding material is injected into the spool 8 of the third split die 13 laminated in the above. The molding material injected into the spool 8 flows through the runner 7 on the upper part of the second split mold 12 and reaches the gate 5. Then, all the cavities flow through the gate 5 and the first intermediate portion 41 into the cavity portion 4, and flow along the cavity portion 4 with the cavity portion 4 extending along the surface 2a of the base material 2 as a flow path. Part 4 is filled. The surplus molding material after filling all the cavity portions 4 is discharged from the cavity portion 4 to the vent 6 via the second intermediate portion 42, and is stored in the surplus material reservoir 6b. After the molding material is cured, the base material 2 having the gasket 3 formed on the surface 2a is removed from between the first split mold 11 and the second split mold 12, thereby completing the seal component 1.

By using the split type molding die 10 in this way, the gasket 3 can be efficiently molded on the surface 2a of the base material 2.

The above is the explanation of this embodiment.

In the above, the case of manufacturing the seal component 1 for the separator of the fuel cell has been described as an example, but the molding die of the present invention is a type in which an endless gasket extending along the surface of the base material is formed. It can be used for any sealing component. Therefore, it may be used for manufacturing a seal component other than the seal component for a fuel cell separator.

The present invention is useful for suppressing a decrease in insulation due to egre.

1: Seal parts,
1': Seal parts,
2: Base material,
2a: Surface,
2b: Vent,
3: Gasket,
3a: Base part,
3b: Seal lip part,
4: Cavity part,
5: Gate,
5': Gate,
5a: opening,
5a': Opening,
6: Bent,
6': Bent,
6a: opening,
6a': opening,
6b: Accumulation of surplus material,
7: Runner,
8: Spool,
10: Molding mold,
10': Molding mold,
11: First division type,
12: Second division type,
13: Third division type,
41: First middle part,
41a: 1st bottom,
41b: First side surface,
42: Second middle part,
E: Egure,
E': Egure.

Claims

In a molding die for molding an endless gasket made of an elastic material and extending along the surface of the base material on the surface of a plate-shaped base material.
A cavity portion formed on the facing surface of the molding die facing the surface of the base material and having a mold shape corresponding to the endless shape of the gasket.
A gate that extends toward the cavity in the molding die and introduces a fluid molding material that becomes an elastic material by curing into the cavity.
The first intermediate portion that receives the molding material from the gate and feeds it into the cavity portion, and connects the opening of the gate and the cavity portion that are opened toward the cavity portion side to connect the cavity portion to the base material. A first intermediate portion having a cross-sectional area along the surface equal to or larger than the opening area of the opening of the gate,
A vent extending from the cavity portion in the molding die in a direction away from the cavity portion and for discharging unnecessary gas unnecessary for molding the gasket in the cavity portion from the cavity portion.
A second intermediate portion that receives the unnecessary gas from the cavity portion and sends it to the vent, and connects the opening of the vent and the cavity portion that are opened toward the cavity portion side to connect the cavity portion to the surface of the base material. A molding die comprising a second intermediate portion having a cross-sectional area equal to or larger than the opening area of the opening of the vent.
The molding die is a split type molding die.
A first split type in which the base material is placed in contact with the surface of the base material on the side opposite to the surface of the base material.
It is a second split type that sandwiches the base material with the first split type and fixes the base material, and has the facing surface on which the cavity portion is formed as a surface on the side that sandwiches the base material. At the same time, the gate, the first intermediate portion, the vent, and the second intermediate portion are formed inside, and further extend in a direction along the base material on a surface opposite to the facing surface and connect to the gate. The second division type in which the runners are formed
A third division type that is laminated on the opposite surface of the second division type and has a spool formed through the third division type and connected to the runner of the second division type. The molding die according to claim 1, further comprising a mold.
The molding die according to claim 1 or 2, wherein the molding die is a molding die for manufacturing a seal component for a fuel cell in which the gasket is integrally molded with the base material.
Plate-shaped base material and
An endless gasket made of an elastic material formed on the surface of the substrate and extending along the surface of the substrate.
The gasket is formed by injecting a fluid molding material, which becomes an elastic material when cured, into a molding die having a gate and a vent, and is formed into the gate at the time of molding. A sealing component having a pedestal protruding in a direction away from the surface of the base material at each of a position close to the base material and a position close to the vent during molding.